Boiler Installation in Cardiff

Boiler Installation in Cardiff Matty August 24, 2022
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Boiler installations in Cardiff

Replacing your boiler in Cardiff can be tricky. From picking the boiler brand and model to finding a trusted Gas Safe engineer to fit it and then arranging the installation date and sorting out payment – this process can take days, if not weeks.

But when you buy a boiler from WarmZilla, we take the hassle out of the boiler buying process, and you can pay in instalments with 0% APR.

With WarmZilla, you’re guaranteed to get the best price on your new boiler, and if you find the same boiler package cheaper elsewhere in the Welsh capital, let us know, and we’ll beat it by £50. 

Average boiler prices in Cardiff and South Wales


If you’re shopping for a new boiler in Cardiff and South Wales, you’ll see that the average boiler installation cost is £2,500 – but can you find a better deal? Yes, in fact, you can – just answer a few questions to get a quick boiler quote in minutes.

As part of your WarmZilla boiler package, you’ll get your chosen boiler along with the necessary flue kit needed for your central heating system, installation service from a qualified Gas Safe engineer, a free system cleanse of your central heating system, a chemical inhibitor for added protection and more!

We pride ourselves on the quality of our instals, affordable prices and extended warranties to give you the peace of mind that you deserve.

Boiler installation costs in Cardiff and South Wales


As a Welsh startup, we started our operations in Cardiff back in 2019. Since then, we have installed thousands of boilers across South Wales in areas like Barry, Llanrumney, Whitchurch, Penarth and St Mellons.

Boiler installation costs differ based on the type and size of the boiler. It also varies if you’d like to move the boiler from one room to another and can differ based on the location of your house. 

To give you a rough estimate, you can expect to pay around £1,860 for a combi installation in Cardiff and £2,000 for a conventional or system boiler installation. If the job is a back boiler conversion, expect to pay around £2,700 because it’s a complex job.

Which boilers are best?

Picking the best boiler from many boiler brands can be confusing. At the end of the day, if you’re about to spend over £2,000 on a new boiler, you want to make sure that the manufacturer is known for its build quality, exceptional customer service and long warranties – that’s why we only sell world-leading boiler brands like Worcester Bosch, Ideal, Viessmann, Vaillant, Vokera and ATAG.

Read our blogs to find which combi, system and conventional boilers are best for your home. 

Gas boiler types


There are 3 main gas boiler types; combination boilers, system boilers and conventional boilers – here’s the difference:

  • Combination boilers don’t have any tanks; they heat water from the mains water supply. Combi boilers tend to be the best option for most UK homes as they don’t need storage tanks and offer heating and hot water on demand.
  • System boilers have a hot water storage tank, usually in an airing cupboard. System boilers are usually found in households with more than one bathroom in use at the same time (high hot water demand).
  • Conventional boilers have a hot water tank and a cold water storage tank (usually in the attic). Regular boilers are useful for homes with low water pressure as they utilise a ‘gravity fed’ system, but due to the tanks involved, most homes switch to a combi boiler when replacing a regular boiler.

If you’d like to know which boiler type and size is best for your home, answer a few questions in our online survey, and we’ll recommend the best boilers for your home. 


Gas boiler replacement in Cardiff


Your boiler could last between 10-15 years, or even longer – if it is well maintained.

If your boiler stops working entirely and can’t be fixed, you’ll have to replace it immediately, but bear in mind that many other less obvious signs let you know it’s time to say goodbye!

Here are the top 6 warning signs;

  • An unexplained rise in energy bills – naturally, boilers lose efficiency over time, which means your energy bills will go up regardless, but if your energy bills are creeping up out of control, this might be a sign that your boiler needs replacing.
  • Your boiler makes odd noises such as banging, whistling, popping or hissing sounds.
  • Your boiler is leaking – while leaking doesn’t mean you have to replace your boiler, it is a sign that there are issues in one of the internal components. We recommend calling a heating engineer to check it out before it becomes more serious.
  • Frequent breakdowns – this happens a lot towards the end of the boiler’s lifespan and it may be time to start shopping around for a new boiler.
  • The boiler doesn’t heat your home as it used to and doesn’t provide hot water either.
  • Finding replacement parts for your boiler is a nightmare.

Before you commit to the big purchase, ask a heating engineer to check that there isn’t a build-up in your heating system preventing your boiler from working as it should, and if you’d like to get a fixed price quote for a new boiler to evaluate if it’s worth fixing your current boiler or getting a new one, take our boiler survey.

Brand Partners
Boiler replacement in Cardiff

WarmZilla makes buying a boiler simpler, faster, and cheaper. By removing salesmen from the process, we save a fortune, and we pass that saving on to our customers. Also, because we fit so many boilers every year, we get a good price on them, allowing us to offer our best price boiler guarantee. If you find a cheaper boiler price, we’ll beat it by £50.

Answer some simple questions about your home in our online survey and we’ll give you a selection of boilers that suit your requirements, choose the boiler that you like the look of, select your installation date and you’re done.

The price you pay is fixed, so if your boiler installation turns out to be more complicated than we originally thought, you won’t pay a penny more.

Your Gas Safe engineer will come from or the surrounding area. WarmZilla has a network of Gas Safe engineers around the U.K known as WarmInstallers.

By buying your boiler from WarmZilla, you are still supporting local tradespeople that are vetted and subcontracted by WarmZilla to fit your boiler.

WarmZilla customers think that the WarmZilla service is ‘Excellent’, based on an average review score of 4.8 out of 5 on Trustpilot.

Each and every WarmInstaller is thoroughly vetted by WarmZilla before fitting a boiler and with every boiler installation, they are required to complete a pre and post-installation checklist to ensure that each and every job is completed to very specific standards.

After a job is completed, we take multiple photographs which are sent to our engineering team in-house for review.

This is how WarmZilla ensures high standards of boiler installation, on every boiler replacement we fit.

In most cases, WarmZilla can install your new boiler within 48 hours of ordering. If you are without hot water or heating, please get in touch with us. We may have additional cover in that will allow us to fit your boiler the next day. 

Most boiler installations are completed within one day. If it’s a simple job like a combi to combi boiler swap then we may be able to get the job done in 4 to 5 hours.

If you are converting a regular or system boiler to a combi, then please allow for up to two days’ work. Our heating engineers will always do their best to leave you with heating and hot water overnight.

WarmZilla install premium boiler brands such a ATAG, Worcester Bosch, Vaillant, and Viessmann. We also install budget boilers such as Ideal and Vokera. This gives a nice range of reliable boilers whatever your budget.

Any boiler sold by WarmZilla comes with Gas Safe installation, system filter, system cleanse, inhibitor, wireless thermostat, up to 12 years guarantee, any flues or extension kits you may need; plus, if your condensate or gas pipes require upgrading – that’s included in your fixed price boiler quote too!

You can also upgrade your wireless thermostat to a choice of smart thermostats and you can add radiators to your order – all your heating requirements with one easy online purchase.


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survey for instant prices